A LIST OF INDIANA ANTS. 463 



Subgenus N ylanderia Emery 



21. P. (N.) parv ida Mayr Q — Hammond. 



Nests under stones in small colonies in rather dr3\ sunny places. It is 

 easily distinguished from the preceding species by its smaller size and the 

 blunt hairs covering the body. The pupsE are naked. 



Genus Lasius Fabricius. 



22. L. niger L. var. neoniger Emery g — Shoals; Arlington. 



This form of the circumpolar L. niger is properly subboreal, being most 

 abundant in British America and on mountains in the United States. The 

 females and workers are easily recognized by the suberect hairs on the 

 antennal scapes and tibiae. 



23. L. niger. L. susp. alienus Fdrster var. americanus Emery S 9 cT — 



Hammond; Vawter Park; Veedersburg; Knox County; Grand Chain. 

 This is the most abundant of all our ants, occurring over the whole of 

 North America except the artic and extreme southern and southwestern' 

 portions. It is distinguished from the typical niger of Eurasia and the 

 preceding variety by the absence of suberect hairs on the tibiae and antennal 

 scapes in the female and worker. Like all of our species and varieties of 

 Lasius, americanus is much given to cultivating root-coccids and root-aphids, 

 but, with the exception of neoniger, it is the only one of our forms that is 

 not exclusively subterranean in its habits. It may often be seen visiting the 

 foliage of trees and bushes in search of small insects. Prof. A. S. Forbes 

 and other have shown that it is of considerable economic importance on ac- 

 count of its injurious habit of cultivating the root-aphids of maize (Aphis 

 maidradicis). 



Subgenus Forwicina Shuckard. 



24. L. (F.) flavus DeGeer subsp. nearcticus Wheeler. 



Not recorded from Indiana but undoubtedly occuiTing in the state. It 

 nests under stones in shady woods. 



25. L. (F.) brevicornis Emery. — 



Not recorded from Indiana but undoubtedly occurring in the state. It 

 nests under stones on dry open hill slopes. 



26. L. (F.) umbratus Nylander subsp. mixtus Nylander var. aphidicola 



Walsh. 

 Common in Illinois and the Eastern States and undoubtedly occurring in 

 Indiana. It nests under stones or in earthern mounds in rather damp sit- 

 uations. 



Subgenus Acanthomyops Mayr. 



27. L. {A.) daviger Roger S — Stark Count3^ 



The yellow Lasii of this subgenus are all subterranean, or "hypogaeic" 

 ants which attend aphids and coccids on the roots of plants and are easily 



